摘要
使用马来酸酐(MAH)、3-氨基-1H-1,2,4-三唑(ATA)试剂接枝改性的聚丙烯(PP),与采用ZnCl_(2)预处理的棉杆木质素,通过双螺杆挤出和注射成型的方法制备了4种不同质量比的棉杆木质素/PP-g-MAH复合材料,并进行了室内热氧老化,通过红外、差热分析表征了材料的结构与热性能,并测定了材料老化前后的力学性能、流变性能和微观形貌。结果表明,复合材料组分间以Zn^(2+)为配位中心的配位键形式相连接,该结构可作为力学牺牲键大幅提高材料的力学性能。木质素的加入,可减缓热氧对PP的老化速度,提高PP的使用寿命,当木质素含量为10 wt%时,试样老化后冲击强度和断裂伸长保留率最优,分别达到79.1%和86.1%;木质素含量15 wt%的试样老化后表面最光滑,未出现明显沟壑裂纹,10 min静态扭矩达最大值且下降趋势最缓。
Polypropylene(PP)grafted with MAH and ATA reagent,cotton lignin pretreated with ZnCl_(2),four kinds of cotton stalk lignin/PP-g-MAH composites were prepared by screw extrusion and injection molding,and were subjected to indoor thermal oxygen aging.The structure and thermal property of composites were characterized by FTIR and DSC.The mechanical properties,rheological properties and microstructure of composites before and after aging were also measured.The results showed that the components of composites were connected in the form of coordination bonds with Zn^(2+) as the coordination center.This structure could be used as a mechanical sacrificial bond to greatly improve the mechanical properties of composites.The addition of lignin would slow down the aging rate of PP caused by thermal oxygen and increase its service life.When the lignin content was 10 wt%,the impact strength retention and elongation retention at break rate of the sample after aging were optimal,reaching 79.1%and 86.1%,respectively.The sample with lignin content of 15 wt%had the smoothest surface after aging and no obvious gully cracks appeared.The static torque at 10 min was the largest and the downward trend was the slowest.
作者
何明宇
徐文豪
李颖
买买提江·依米提
HE Mingyu;XU Wenhao;LI Ying;MAMATJAN Yimit(Key laboratory of Oil and Gas Fine Chemicals,Ministry of Education and Xinjiang Uyghur Autonomous Region,College of Chemical Engineering,Xinjiang University,Urumiqi 830046,China)
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2022年第3期448-454,共7页
Journal of Materials Science and Engineering
基金
国家自然科学基金资助项目(21764013)
自治区研究生科研创新资助项目(XJ2020G033)。
关键词
棉杆木质素
马来酸酐接枝聚丙烯
热氧老化
力学性能
抗氧化
Cotton stalk lignin
Maleic anhydride grafted polypropylene
Thermal and oxygen aging
Mechanical properties
Anti-oxidation
